lisp/lpr.el

   1 ;;; lpr.el --- print Emacs buffer on line printer.
   2
   3 ;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: unix
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Commentary:
  25
  26 ;; Commands to send the region or a buffer your printer.  Entry points
  27 ;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
  28 ;; variables include `lpr-switches' and `lpr-command'.
  29
  30 ;;; Code:
  31
  32 ;;;###autoload
  33 (defvar lpr-switches nil
  34   "*List of strings to pass as extra switch args to `lpr' when it is invoked.")
  35
  36 (defvar lpr-add-options (eq system-type 'berkeley-unix)
  37   "*Non-nil means construct -T and -J options for the `lpr'.")
  38
  39 ;;;###autoload
  40 (defvar lpr-command
  41   (if (memq system-type '(usg-unix-v dgux hpux irix))
  42       "lp" "lpr")
  43   "*Name of program for printing a file.")
  44
  45 (defvar lpr-headers-switches
  46   (if (memq system-type '(usg-unix-v dgux hpux irix)) nil "-p")
  47   "*List of strings to use as options for `lpr' to request page headings.")
  48
  49 (defvar print-region-function nil
  50   "Function to call to print the region on a printer.
  51 See definition of `print-region-1' for calling conventions.")
  52
  53 (defvar lpr-page-header-program "pr"
  54   "*Name of program for adding page headers to a file.")
  55
  56 (defvar lpr-page-header-switches nil
  57   "*List of strings to use as options for `lpr-page-header-program'.")
  58
  59 ;;;###autoload
  60 (defun lpr-buffer ()
  61   "Print buffer contents as with Unix command `lpr'.
  62 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  63   (interactive)
  64   (print-region-1 (point-min) (point-max) lpr-switches nil))
  65
  66 ;;;###autoload
  67 (defun print-buffer ()
  68   "Print buffer contents as with Unix command `lpr -p'.
  69 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  70   (interactive)
  71   (print-region-1 (point-min) (point-max) lpr-switches t))
  72
  73 ;;;###autoload
  74 (defun lpr-region (start end)
  75   "Print region contents as with Unix command `lpr'.
  76 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  77   (interactive "r")
  78   (print-region-1 start end lpr-switches nil))
  79
  80 ;;;###autoload
  81 (defun print-region (start end)
  82   "Print region contents as with Unix command `lpr -p'.
  83 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  84   (interactive "r")
  85   (print-region-1 start end lpr-switches t))
  86
  87 (defun print-region-1 (start end switches page-headers)
  88   ;; On some MIPS system, having a space in the job name
  89   ;; crashes the printer demon.  But using dashes looks ugly
  90   ;; and it seems to annoying to do for that MIPS system.
  91   (let ((name (concat (buffer-name) " Emacs buffer"))
  92         (title (concat (buffer-name) " Emacs buffer"))
  93         (width tab-width))
  94     (save-excursion
  95       (message "Spooling...")
  96       (if (/= tab-width 8)
  97           (progn
  98             (print-region-new-buffer start end)
  99             (setq tab-width width)
 100             (save-excursion
 101               (goto-char end)
 102               (setq end (point-marker)))
 103             (untabify (point-min) (point-max))))
 104       (if page-headers
 105           (if lpr-headers-switches
 106               ;; On BSD, use an option to get page headers.
 107               (setq switches (append (if (stringp lpr-headers-switches)
 108                                          (list lpr-headers-switches)
 109                                         lpr-headers-switches)
 110                                      switches))
 111             (print-region-new-buffer start end)
 112             (call-process-region start end lpr-page-header-program
 113                                  t t lpr-page-header-options)
 114             (setq start (point-min) end (point-max))))
 115       (apply (or print-region-function 'call-process-region)
 116              (nconc (list start end lpr-command
 117                           nil nil nil)
 118                     (nconc (and lpr-add-options
 119                                 (list "-J" name "-T" title))
 120                            switches)))
 121       (if (markerp end)
 122           (set-marker end nil))
 123       (message "Spooling...done"))))
 124
 125 ;; This function copies the text between start and end
 126 ;; into a new buffer, makes that buffer current,
 127 ;; and sets start and end to the buffer bounds.
 128 ;; start and end are used free.
 129 (defun print-region-new-buffer (ostart oend)
 130   (or (string= (buffer-name) " *spool temp*")
 131       (let ((oldbuf (current-buffer)))
 132         (set-buffer (get-buffer-create " *spool temp*"))
 133         (widen) (erase-buffer)
 134         (insert-buffer-substring oldbuf ostart oend)
 135         (setq start (point-min) end (point-max)))))
 136
 137 (defun printify-region (begin end)
 138   "Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
 139 in the current buffer into printable representations as control or
 140 hexadecimal escapes."
 141   (interactive "r")
 142   (save-excursion
 143     (goto-char begin)
 144     (let (c)
 145       (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
 146         (setq c (preceding-char))
 147         (delete-backward-char 1)
 148         (insert
 149          (if (< c ?\ )
 150              (format "\\^%c" (+ c ?@))
 151            (format "\\%02x" c)))))))
 152
 153 ;;; lpr.el ends here